Changed "markup" mechanism to rely on two separate files (one for

Changed "markup" mechanism to rely on two separate files (one for
element names, one for param names -- both located in xsl/docsrc)
instead of one. Also added "stopwords" mechanism for suppressing
markup of certain common words (set, code, parameter, etc.). And
changed handling of commiter names such that commiter names and
filename/revision info are now put into an Alt child (which
causes them to be output as the content of "title" attributes in
HTML output, so the info is accessible as "tooltip text".